Produtividade e massa fresca de bulbos de cebola sob densidades de plantio no Vale do São Francisco

Resende, G. M. de; Costa, N. D.

doi:10.1590/s0102-05362006000200022

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…In both crops, increased population density of the onion transplanted provided yield drop of commercial bulbs, regardless of coexistence or not with weeds. These results corroborated those reported by Viegas D'Abreu (1996), Stoffella (1996), Rumpel & Felczynski (2000), Cecílio Filho et al (2006) and Resende & Costa (2006), who found a greater reduction in bulbs yield with the increase of the crop planting density. However, Baier et al (2009) have found that increasing the density of onion plants per m 2 gave lower average mass of bulbs and increased yield in commercial classification 3 filled in a study conducted in Guarapuava, PR.…”

Section: Resultssupporting

confidence: 91%

Weed Interference Periods and Transplanting Densities of Onion Crop in the Brazilian Region of Guarapuava, PR1

et al. 2016

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-The study was conducted with the objective of determining the critical periods of interference prevention (CPIP) and the best period for the management of weeds community in onion crop Crioula Mercosul genotype, transplanted in distinct plants densities. The experiment was carried out in field conditions in the Brazilian municipality of Guarapuava, Paraná State, during the 2012 and 2013 agricultural years, at Universidade Estadual do Centro-Oeste -UNICENTRO. Treatments were disposed in randomized complete blocks and experimental design, with five repetitions, consisting of weeds coexistence periods and weeds control at 14, 28, 56, 112 and 168 days after transplanting the seedlings (DATS), using 0.6, 0.8 and 1.0 million plants ha -1 . Weeds community was evaluated through a phytosociological survey at the end of each coexistence period in relation to yield and commercial quality of bulbs. Bulbs yield of transplanted onion was significantly affected by weeds coexistence, reaching 100% of losses. From adjusted models, viability was not observed in increasing plantation density as a practice that may favor the necessary reduction of weeds control. Onion plants transplanted in August 2012 and July 2013 presented CPIP, respectively, of 23 at 76 and 21 at 120 DATS for commercial bulbs yield, and of 20 at 55 and 26 at 112 DATS for total bulbs yield, respectively. Keywords:Allium cepa, competition, plant arrangement, bulb yield. RESUMO -O trabalho foi realizado com o objetivo de determinar os períodos críticos de prevenção da interferência das plantas daninhas (PCPI) na cultura da cebola cultivar

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Section: Resultssupporting

confidence: 91%

Weed Interference Periods and Transplanting Densities of Onion Crop in the Brazilian Region of Guarapuava, PR1

et al. 2016

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“…Resende and Costa (2006) observed similar behavior for the onion cultivar Texas Grano, being influenced only by storage time. Moreover, the mass loss of the bulbs during storage varies among the cultivars onion and these are less marked when adopts the organic cultivation system (RESENDE et al, 2010).…”

Section: Cultivarssupporting

confidence: 61%

Soil covering in organic cultivation of onion cultivars

Tavella¹,

Ferreira²,

Neto³

et al. 2015

Agro@mbiente

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Abstract:The soil preparation in horticulture, including organic, is characterized by intense soil tillage, which increases energy costs and unbalanced the environment. The organic system in onion cultivation has shown satisfactory results, however the soil covering use tends to improve the cultivation environment and may result in higher yields. The objective of this work was to evaluate the performance of onion cultivars in organic cultivation under different soil coverages. The experiment was conducted in the period of April to October of 2009, under protected cropping, in the experimental area of the horticulture sector of the Universidade Federal do Acre (UFAC), in Rio Branco, Acre, Brazil. A randomized block design was adopted, in a split-plot arrangement, the plots being comprised of soil coverings: coffee bean husks, grass straw (Brachiaria decumbens); dessicated bamboo leaves (Bambusa spp.) and uncovered soil (control treatment), and the subplots comprised of three onion cultivars (IPA 10, IPA 11 and IPA 12), with four repetitions. The variables analyzed were total bulb yield (t ha -1 ), marketable bulb yield (t ha -1 ), fresh mass of the bulb (g bulb -1 ), classification of the bulbs and loss of mass as a function of storage time. There was no interaction effect between the soil coverings and the cultivars. Cultivars IPA 10 and IPA 11 showed greater agronomic performance of the studied variables. The soil coverings did not affect the yield and average mass of the bulbs under organic cultivation. The three cultivars presented more than approximately 70% of the bulbs in class 2 and a maximum of 5% of unmarketable bulbs. The loss of mass after 49 days of storage was 10% independent of the cultivar or soil covering.Key words: Allium cepa. Organic agriculture. Sustainability.Resumo: O preparo do solo na olericultura, incluindo a orgânica, caracteriza-se por intenso revolvimento do solo, o que aumenta os gastos com energia e desequilibra o ambiente. O cultivo de cebola em sistema orgânico tem mostrado resultados satisfatórios, todavia o uso de cobertura do solo tende a melhorar o ambiente de cultivo, podendo resultar em maior produtividade. O objetivo deste trabalho foi avaliar o desempenho de cultivares de cebola em cultivo orgânico sob diferentes coberturas do solo. O experimento foi conduzido no período de abril a outubro de 2009, em cultivo protegido, na área experimental do setor de olericultura da Universidade Federal do Acre (UFAC), em Rio Branco, Acre, Brasil. Adotou-se delineamento experimental em blocos casualizados, com arranjo em parcelas subdivididas, sendo as parcelas constituídas pelas coberturas de solo: casca de café, palha de gramínea (Brachiaria decumbens); folha de bambu dessecada (Bambusa spp.) e solo descoberto (tratamento controle), e as subparcelas constituídas pelas três cultivares de cebola (IPA 10, IPA 11 e IPA 12), com quatro repetições. As variáveis analisadas foram produtividade total de bulbos (t ha -1 ), produtividade comercial dos bulbos (t ha -1 ), massa fresca do bulbo (g b...

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“…Os resultados obtidos no presente trabalho evidenciam uma relação inversa entre a densidade de plantio e o tamanho do bulbo, corroborando com os resultados de Hatridge-esh & Bennett (1980), Resende & Costa (2006), Rumpel & Felczynski (2000) e Stoffella (1996). Reghin et al (2004) ao avaliarem o rendimento de bulbos das cultivares Crioula e Bola Precoce, utilizando espaçamento de 0,40 m entre linhas e quatro diferentes espaçamentos entre plantas (5, 8, 11 e 14cm) observaram que, na menor densidade não houve diferenças entre as duas cultivares quanto à produtividade e proporção de bulbos comercializáveis, contudo verificaram comportamento diferenciado entre genótipos nas demais densidades de plantio.…”

Section: Resultsunclassified

Produtividade e rendimento comercial de bulbos de cebola em função da densidade de cultivo

et al. 2009

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RESUMOA distribuição adequada das plantas de cebola (Allium cepa L.) na lavoura torna-se necessária devido a influência sobre a competição por água, luz e nutrientes, determinando o tamanho dos bulbos e a produtividade total. Objetivou-se, no trabalho, avaliar a produtividade e os padrões comerciais de bulbos de cebola, em função da densidade de plantio adotada. As mudas de cebola foram produzidas em bandejas de poliestireno de 200 células, com substrato comercial Plantimax®. O experimento foi instalado em delineamento experimental de blocos casualizados (DBC) com 4 repetições, com parcelas de 2 m 2 . Utilizou-se a cultivar Buccaneer, nas densidades de 50, 75 e 100 plantas m -2 . Foram avaliadas a produção comercial, a produção total e a massa média de bulbos. Observou-se que a densidade de 100 plantas m -2 proporcionou a maior produtividade (92,20 t ha -1 ). No entanto, a menor densidade de plantas avaliada proporcionou bulbos com a maior massa média (171g). As densidades de 50 e 75 plantas m -2 apresentaram os maiores valores distribuídos na classe 4 (> que 70 até 90 mm de diâmetro) e 3 cheio (> que 60 até 70 mm de diâmetro), respectivamente. A densidade de 100 plantas m -2 proporcionou uma maior quantidade de bulbos na classificação 3 cheio. Os resultados obtidos demonstraram que o aumento na densidade de plantas proporcionou uma maior produtividade, uma menor massa média de bulbos e uma maior produção na classificação comercial 3 cheio, considerada ideal para comercialização em função da preferência pelos consumidores. Termos para indexação:Allium cepa, densidade populacional, classificação comercial. ABSTRACTThe adequate distribution of onions (Allium cepa L.) within a crop becomes necessary due to their influence on the competition for water, light, and nutrients, which determines the size of the bulbs and the total yield. The goal of this work was to evaluate the yield and commercial pattern of onion bulbs as a function of the crop density employed. The onion seedlings were produced on polystyrene trays with 200 cells filled with commercial substrate Plantimax®. The experiment was carried out according to a randomized block design (RBD), with four replications and 2-m 2 plots. The cultivar Buccaneer was evaluated in densities of 50, 75, and 100 plants m -2 . The commercial bulb yield, the total yield, and the average mass of bulbs were evaluated. The density of 100 plants m -2 provided the greatest yield (92.20 t ha -1 ). However, the lower density of plants provided bulbs with the greatest average mass (171g). Densities of 50 and 75 plants m -2 presented the greatest values distributed in class 4 (> 70 up to 90 mm of diameter) and 3 full (> 60 up to 70 mm of diameter), respectively. Density of 100 plants m -2 provides a larger amount of bulbs in the 3-full classification. The results obtained in this experiment showed that an increase in the density of plants provided greater yield, smaller average mass of bulbs and greater production in the commercial 3-full classification, which is considered ideal for...

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Produtividade e massa fresca de bulbos de cebola sob densidades de plantio no Vale do São Francisco

Cited by 4 publications

References 6 publications

Weed Interference Periods and Transplanting Densities of Onion Crop in the Brazilian Region of Guarapuava, PR1

Weed Interference Periods and Transplanting Densities of Onion Crop in the Brazilian Region of Guarapuava, PR1

Soil covering in organic cultivation of onion cultivars

Produtividade e rendimento comercial de bulbos de cebola em função da densidade de cultivo

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